Diesinking mechanism



Patented pr. 29, 1924.

PATENT OFFICE.

FRANK RUSCHKE, OF SYRAC'USE, NEW YORK.

DIESINKING MECHANISM.

Application led January 6, 1923. Serial No. 611,043.

To all whom t may concern.' e

Be it known that I, FRANK RUsoHKE, a citizen of the United States, residing at Syracuse, in the county of Onondaga and State of New York, have invented certain new and useful Improvements in Diesinking Mechanism, of which the following is a specification.

This invention relates to die-sinkers, designed for use by die-makers, and the like, for cutting sunken dies, particularly ofthe type employed for producing die-castings.

Heretofore, the work of sinking dies has. been largely eected by circular cutters, which have been mounted upon arbors, such as the tool-arbore commonly associatedwith the ordinary milling-machines, and the cut` tingranges of the said tools has invariably been limited tothe clearance between the arbors and the periphery of the circular cutters. In ,cases where the die cavities are to be of greater depth than the range of these older cutters, some other kind of tools musi be employedfor completing the die-sinking work. It is aparticular object of the present invention, to provide a circular die-sinking tool, which, instead of being mounted upon an arbor, as described, is rotatably disposed between two jaws of peculiar and novel construction,which allow the said tool to be sunk more thanone-half of its diameter during the die-sinking operations. A kfurther object is to provide a novel and simple holder for the die-sinking mechanism, which may be readily attached to the adjustable arm of any ordinary milling machine. And a further object is to provide novel and simple means for driving the circular cutter, and for connecting the said means with a driven part of the milling machine.

I attain these objects by the means set forth in the' vdetailed description whichr follows, and as illustrative by the'accompanjL ing drawing, in whichf Figure `1 is a broken side elevationl of a milling machine to whichl my improvement is applied. F ig. 2 is a transverse vertical section, taken on line 2 of Fig. l; showing the lmeans for driving the rotary cutter. Fig. 3 is a horizontal section, taken on line 3-3 of Fig. 2. Fig. 4 is a fragmentary vertical section, taken on line 4 of Fig. 2. Figs. 5 and 6 are respectively an edge and a face view of the gear-supporting plate. And Figs. 7 and 8 are respectively edge views of the' detachable jaws,'which directly support the die-cutter.

In the drawing, 2 represents the head of a milling-machine; 3 isy the adjustable arm, common to machines of the class, and 4 is the arbor or spindle, which usually supports the rotary milling cutters, and may be driven by any suitable power.

' My improvement consists of the following part-s: 5 represents the holder`for the diesinking mechanism, which preferably comprises a` split loop 5', and an integral depending shank 58. The loop 5 is preferably bored out to slidably fit the arm 3, to which the holder may be rigidly clamped by bolts 5", which pass through spaced flanges 5. The shank 5a is hollow, and preferably has one open'side, which may be closed by a removable plate 56, the latter being held in place byk screws 5. 6 represents one form of rotary die-cutter, which may be'used in connection with the other parts of the invention.- The shank` 5a is usually disposed in the line of the transverse axis of the arbor 4, but may be adjusted and set at any suitable angle relatively to the arm 3, if desired. The closed side 5d of the shank 5a preferably faces the arbor 4, and is provided with a horizontal opening to receive an arbor or shaft 7. The shaft 7 is shown journaled in a sleeve 9, which may be integral to a plate 9, and the'said plate is disposed vertically in the hollow shank, as shown in Figs. l, 2, 3 and 4. The shaft 7 extends through the plate 9, and on its inner end is mounted a spur-gear 8, which bears against said plate. Below the gear 8, the plate 9 is provided with a number of alining regularly spaced trunnions 9a, upon which may be rotatably mounted a train of similar spur-gears, as 8', 8a and 8b', all of the said gears meshing, and the gear 8 being arranged to drive the whole train, including the cutter 6. 'Ihe lowermost gear Sb is preferably so disposed that its teeth 8 successively engage the ra dial teeth or cutting-spurs 6' of the cutter i'. for rotating the said cutter during the die Ico sinking operations. The arrows in Fig. 2 show the directions of rotation of the cut ter 6 and the several gears 8. The teeth of the cutter are preferably formed with curved back-faces 6b, and the construction and arrangement of the gear 8b is such that, its teeth 8C frictionally engage these curved faces, but do not contact with or injure the sharp cutting points of the teeth 6. The ar bor 7 may be driven by the arbor 4 of the milling machine, by means of a shaft 10 and any kind of universal couplings 10 and 10a.

The circular cutter 6 is rotatably supported by axially alining disc-shaped portions 12, of a pair of normally spaced jaws 12 and 12a, which are detachably carried by the shank 5a, and whose bottom ends extend belowsaid shank. The discs 12 are the sole support for the cutter 6, and perform the same function as the arbors heretofore employed, for supporting cutting tools of the class. To facilitate this novel mounting of the cutter 6, the opposite faces of said cutter are countersunk, as at 6, to receive the discs 12. In the preferred construction and arrangement of the parts, the outer faces of the discs 12 are disposed flush with the corresponding facesv of the cutter 6, and in order that thev cut-ter 6 may rotate truly and smoothly on the discs 12, the sockets 6a, as well as the facing sides, and the edges of the discs are carefully and accurately ground. The jaws 12 and 12a are disposed longitudinally in the shank 5a, at the opposite sides of the gea-rs 8 and the plate 9, and the jaw 12 is preferably held in place in part by a dove-tail arrangement, shown at 12b in Fig. 3. After the parts 5e, 8, 9, 12 and 12a are disposed in the shank't7 they may be rigidly clamped and held in place by a bolt 13, in a wellknowngmanner. Vhen the cutter 6 is placed in position between the discs 12 (see Figs. 1. and 4) thesep-arts may be held in place and at the proper tension by means of a bolt 12C, as best seen in Fig. 4. The discs 12 are preferably integral parts of the jaws 121-12, and connectnwith the bodies of the jaws by angular portions 12d, which preferably terminate slightly above the centers or axes of the cutterI 6 and the discs, as shown in Figs. 1 and 4. By this construction and arrangement. the cutter 6 maybe lowered into the work x, during the diesinking operations, slightly beyond its axis (12C). In this manner` a die may be sunk to ak greater depth, without requiring any change or stoppage of the mechanism, and without necessitating the employment of any extrar tools or operations, than is possible by any of the older methods, wherein the circular milling tools are mounted on arbors. as explained. In case a die cavity has been enlarged laterally to a greater breath than the thickness of the tooI 6, the

latter, by reason of the tapering angular portions 12d of the jaws, may be sunk still deeper into the work than that shown in Figs. -1 and 2.

Obviously the number of the driving gears 8 may be varied, and various other changes or re-arrangements may be made 1n the mechanism, in order to adapt my improvement for sinking dies of different character, without departing from the invention, as herein shown, described and claimed.

Having thus described my invention, what I claim, iss- 1. In a die-sinking mechanism, a. kcircular cutting toolvhaving socket bearingsin its opposite` sides, a pair of jawsengaging said bearings for rotatably supporting said tool, a power driven shaft-.for operating said tool, a train of meshed gears oper atively connecting said shaft with said tool, a support for said gears removably inclosed between said jaws, and. means removably supporting said jaws.

2. In a die-sinking mechanism, a circular cutting tool having circular sockets in its opposite sides, a pair of jaws having disc-shaped portions engaging saidsockets for rotatably supporting said cutting tool, a train of gears for driving said cutting tool, a holder having a recess in which the jaws are removably mounted, a plate interposed between the jaws and supporting the train of gears, means for securing sai jaws and plate in the recess of said holder,

and means for driving said train of gears.

3. In a die-sinking mechanism, a holder adapted to be adjustably appliedfto a milling-machine, said holder having a hollow shank, a circula-r cutting tool, a pair of jaws having axially alining disc-shaped portions for operatively supporting said cutting tool therebetween, said jaws adapted to be detachably inserted in said shank, and a train of gears for driving the i. cutting tool disposed between and carried by said jaws adapted to be driven by a moving part of the milling machine.

4. In a die-sinking mechanism, a circular cutting tool having radial cutting .teeth and having concentric circular sockets in its opposite sides, a pair ofspaced jaws removable as a unit having disc-shaped portions which are received in said sockets for rotatably supporting said cutting tool, a train of meshed gears carried by the jaw for driving said cutting tool. a gear at one end of said train meshing with the teeth of the cutting tool, a driving-shaft supporting the gear at the other end of the tra-in, and means for driving said shaft and said gears` 5. In a die-sinking mechanism. a circular cutter provided with radial cutting spurs and, having axially alining circular sockets in its opposite sides, a pair of spaced jaws having intermediately arranged trunnions said jaws, a train of meshing gears jourand also axially alining portions which latnaled on the trunnions of Said jaws adapted ter engage said sockets for rotatably supto drive said cutter, and a shaft support- 10 porting said cutter1 the said jaws adjacent inor one of said gears and driving said train.

5 said alining portions being angular for n testimony whereof I aiix my signature.

facilitating the Sinking of a die cavity beyond the axis of the cutter, a holder for FRANK RUSCHKE. 

